Chemistry of inorganic compounds – Silicon or compound thereof – Elemental silicon
Patent
1978-06-23
1979-10-30
Cooper, Jack
Chemistry of inorganic compounds
Silicon or compound thereof
Elemental silicon
423149, 423293, 423417, 423625, C01B 3302
Patent
active
041728831
ABSTRACT:
A method wherein a quartz tube is charged with chunks of metallurgical grade silicon and/or a mixture of such chunks and high purity quartz sand, and impurities from a class including aluminum, boron, and the like, as well as certain transition metals including nickel, iron, manganese and the like. The tube is then evacuated and heated to a temperature within a range of 800.degree. C. to 1400.degree. C., whereupon a stream of gas comprising a reactant, such as silicon tetrafluoride, continuously is delivered at low pressures through the charge for causing a metathetical reaction of impurities of the silicon and the reactant to occur for forming a volatile halide and leaving a residue of silicon of an improved purity. Additionally, the reactant may include carbon monoxide gas, whereby impurites such as iron and nickel react therewith to form volatile carbonyls.
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patent: 2989376 (1961-06-01), Schaefer
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patent: 4045541 (1977-08-01), Mercer
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Chaney Robert E.
Frosch Robert A. Administrator of the National Aeronautics and Space
Ingle William M.
Thompson Stephen W.
Cooper Jack
Grifka Wilfred
Manning John R.
Mott Monte F.
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